About Additional Information Fields

Hi,

I have been trying to get Additional Information Fields to work.
I have done as what the Online Help explains but I can only got whinh200 (Warehousing Orders) to work. It now has Additional Information tab in whinh2100m000 (Warehousing Orders); whereas other tables that I put in tcstl2100m000 (Additional Information Definitions) do not have the tab.
Could anyone suggest me anything to get this to work please?

Regards,
Thana